CORALS FROM THE MOUNTAIN LIMESTONE. 205 
Corallum astreiform; Corallites prismatic; principal septa extremely slender, broader, 
and less numerous than in P. J/‘Coyana.* 
In a former work we referred this species to the Genus Sryzaxis of Professor M‘Coy, 
because, from the inspection of the woodcuts given by that author in the ‘Annals of 
Natural History,’ we had been led to suppose that Sty/avis differed from Zithostrotion, by 
the existence of a well-developed septal apparatus, and a lamellar columella; but the 
figures recently published by the same geologist prove that we were mistaken, and that 
the Genus Sryuaxis of Professor M‘Coy does not in reality differ from Lithostrotion ; we 
have, therefore, been obliged to abandon that name, and to establish here a new generical 
division (Petalawis), for the fossils which we formerly named Stylawis M*Coyana? and 
S. Portlock. 
2. Genus AxopHyLuuM, (p. Ixxi.) 
AXOPHYLLUM RADICATUM, Milne Edwards and Jules Haime, Pol. des Terr. Palzeoz., p. 456 ; 
tab. xii, fig. 1, 1851. 
We are inclined to think that the fossil coral, found by Col. Portlock in the car- 
boniferous limestone at Stewartston, Tyrone,’ and referred by that Geologist to the 
Turbinolia verrucosa of Hisinger (which is an Omphyma of the Silurian formation), 
belongs to this species, or is closely allied to it. 
3. Genus LONSDALEIA, (p. lxxi.*) 
1. Lonspaeia FrLorirormis. Tab. XLIII, figs. 1, la, 14, le, 1d, le, 2, 2a. 
Stone found in Wales (?), Liwyd, Phil. Trans., vol. xxi, p. 187, No. 252, figs. 3, 4, 1700. 
Very rough figures. 
ERISMATOLITHUS MADREPORITES (FLORIFORMIS), William Martin, Petref. Derb., tab. xliii, 
figs. 3, 4, and tab. xliv, fig. 5, 1809. 
STYLINA COMPOUND, Parkinson, Introd. to the Study of Foss. Org. Rem., pl. x, fig. 5, 1822. 
Good. 
ASTREA FLORIDA, Defrance, Dict. Se. Nat., vol. xlii, p. 383, 1826. 
LITHOSTROTION FLORIFORME, Fleming, Brit. Anim., p. 508, 1828. 
a — S. Woodward, Table of Brit. Org. Rem., p. 5, 1830. 
CoLUMNARIA FLORIFoRMIS, De Blainville, Dict. Sc. Nat., vol. lx, p. 316, 1830; Man., p. 350. 
CyaTHOPHYLLUM FLORIFORME, Phillips, Geol. of York, vol. ii, p. 202, 1836. 
1 Milne Edwards and Jules Haime, Pol. Foss. des Terr. Palaoz., p. 453, pl. xii, fig. 5. 
2 Polyp. Palzeoz., p. 453, tab. xii, fig. 5. ’ Report on Londonderry, p. 331. 
* Under the name of Lithostrotion. 
